Diamagnetic


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diamagnetic

[¦dī·ə·mag′ned·ik]
(electromagnetism)
Having a magnetic permeability less than 1; materials with this property are repelled by a magnet and tend to position themselves at right angles to magnetic lines of force.

Diamagnetic

 

a substance that becomes magnetized against the direction of an external magnetic field. In the absence of an external magnetic field a diamagnetic is nonmagnetic. Upon exposure to an external magnetic field each atom of a diamagnetic acquires a magnetic moment j (each mole of the substance acquires a total moment J) proportional to the field intensity H and directed against the field. Therefore, the magnetic susceptibility x = J/H is always negative for diamagnetics. The diamagnetic susceptibility χ is small with respect to absolute magnitude and is weakly dependent on both the magnetic field intensity and the temperature (seeTable 1, where xis the susceptibility of 1 mole).

Table 1. Magnetic susceptibility of certain diamagnetics (under normal conditions)
 X x 10-6
Nitrogen (N2)...............-12.0
Hydrogen (H2)...............-4.0
Germanium (Ge)...............-7.7
Silicon (Si)...............-3.1
Water, liquid (H2O)...............-13.0
Table salt (NaCI)...............-30.3
Acetone (C3H6O)...............-33.8
Glycerol (C3H8O3)...............-57.1
Naphthalene (C12H8)...............-91.8(avg.)

Diamagnetics include silicon, phosphurus, bismuth, zinc, copper, gold, silver, the inert gases, nitrogen, and hydrogen. Many organic and inorganic compounds are diamagnetic.

References in periodicals archive ?
Almost complete coincidence of the isolines for the graphs [M.sub.s] = f (Ni, Co, Zn) and [H.sub.r] = f (Ni, Co, Zn) makes it possible to assume that the main factor determining the ferrite magnet is the cation distribution over the sublattices with allowance for the concentration of diamagnetic ions.
All regular electrically charged rotating objects contain de Sitter vacuum disk r = 0 which have the properties of the ideal conductor and ideal diamagnetic. For the objects with the second type of interiors, these properties are characteristic for the whole S-surface.
Callus et al, "The strong diamagnetic behaviour of unidirectional carbon fiber reinforced polymer laminates," Journal of Applied Physics, vol.
While a [sup.1]H spectrum of the chelating agent (e.g., without the [Tm.sup.3+] ion) shows conventional diamagnetic shifts spread over a narrow range (~5 ppm), a [sup.1]H spectrum of the complexed agent (e.g., with the [Tm.sup.3+] ion) shows unusual paramagnetic shifts spread much farther apart (>100 ppm).
The absence of satellite peaks confirms the diamagnetic behavior of nickel center and the square planar geometry of the complex.
Reichenbach, "Differentiation between diamagnetic and paramagnetic cerebral lesions based on magnetic susceptibility mapping," Medical Physics, vol.
On the other hand, substances such as water, organic compounds and living tissues, are considered diamagnetic materials, because their electron spins do not undergo rearrangement in the presence of a MF, and always are repelled by it.
Specifically, we will show that MAS-DNP can become a choice technique for the study of diamagnetic metal binding sites, complementing EPR for the study of metalloproteins.
"Our initial investigations have demonstrated an effective technique to economically produce high quality commercial scale graphene without the use of any growth substrate simply by utilizing the interplay between a magnetic field and the diamagnetic nature of graphene.
The characteristics signal of EPR is generated by T2 copper but detecting it spectromatically is not possible, whereas the diamagnetic T3 copper is bi-nuclear.
This stable free radical accepts an electron or hydrogen radical to become a stable diamagnetic molecule which is widely used to investigate radical scavenging activity.